Restore Peak Performance to Your GM Truck or Van
If you’re wrestling with a Check Engine Light that won’t quit, erratic engine behavior, or transmission shifting problems in your GM vehicle, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can create a cascade of frustrating issues. This is a direct-fit, reliable solution for your 1999 Chevrolet 1500 PCM, programmed specifically for your vehicle to restore its original performance and reliability.
From the Diagnostic Bay
I remember a 2000 GMC Sierra that came into the shop with a complaint of harsh shifting and intermittent stalling. The owner had already replaced the transmission fluid and a few sensors with no luck. The scanner was showing a P0606 (PCM Processor Fault) code, but it was intermittent. After checking the power and ground circuits to the PCM—which is always the first step—we confirmed they were solid. The culprit was a failing processor inside the original PCM. We installed one of these VIN-programmed modules, performed the security relearn, and the truck ran like it just rolled off the factory floor. It’s a fix that saves customers hundreds compared to a dealership visit.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it might be time for a replacement:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, or P0606.
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle won’t start, but the battery and starter are good (no-start condition).
- ✔ Failure to pass an emissions inspection.
A Straightforward Guide to Installation
Replacing your 1999 Chevrolet 1500 PCM is a manageable job for a DIYer with basic tools. Our pre-programming service eliminates the need for expensive dealer-only tools. Just follow these general steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s side fender or near the battery. Consult a repair manual for your specific model’s location.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old PCM: Unbolt the old module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-attach the wiring harness connectors. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure (often called a CASE learn or Passlock relearn). This procedure can typically be done without special tools and involves a sequence of turning the key on and off. We include instructions for this simple process.
Verified Vehicle Compatibility
This module, part number 16263494, is a direct replacement for a wide range of General Motors vehicles. It is also a compatible replacement for part numbers 16265035, 8162634940, 218-11787, and 21811787. Please confirm your vehicle is on this list and provide your VIN upon purchase for correct programming.
CHEVROLET 2500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494 for 99
CHEVROLET 3500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494 for 99
ASTRO 99-01 Electronic Control Module; (LH front by battery), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
BLAZER S10/JIMmy S15 99-00 Electronic Control Module; (RH front engine compartment)
BRAVADA 98 Electronic Control Module; (4.3L), w/build date opt ZN4
BRAVADA 99-00 Electronic Control Module; (RH front engine compartment)
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
ENVOY 99-00 Electronic Control Module; (RH front engine compartment)
EXPRESS/SAVANA 1500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS/SAVANA 2500 VAN 99-02 Electronic Control Module; gasoline (LH rear engine compartment), ID 16263494
EXPRESS/SAVANA 3500 VAN 99-02 Electronic Control Module; gasoline (LH rear engine compartment), ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L (LH engine compartment), ID 16263494
GMC 2500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494 for 99
GMC 3500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494 for 99
ISUZU HOMBRE 98-00 Electronic Control Module; 4.3L (6 cylinder)
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
S10/S15/SONOMA 98 Electronic Control Module; 4.3L, w/build date opt ZN4
S10/S15/SONOMA 99-00 Electronic Control Module; 4.3L (RH front engine compartment)
SIERRA/SILVERADO 1500 PICKUP 99-00 Electronic Control Module; 6 cylinder (LH front under battery)
SUBURBAN 1500/2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
YUKON 00 Electronic Control Module; Denali (LH front under battery)
Frequently Asked Questions
Frequently Asked Questions
Do I need to send my old PCM back (core charge)?
No core charge is required for this purchase. You can keep or recycle your old module.
Is this module difficult to install?
Installation is straightforward for anyone with basic mechanical skills. The main steps are disconnecting the battery, swapping the module, and reconnecting. The key is that we program it beforehand, saving you a trip to a mechanic for flashing.
What does ‘programmed to my VIN’ mean?
It means we load the specific software and calibrations for your vehicle’s exact configuration (engine, transmission, options) directly onto the module using your Vehicle Identification Number. This ensures it works perfectly right out of the box after the simple key relearn procedure.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids in the transmission. If the module is failing, it can cause harsh shifts, delayed engagement, or incorrect gear selection. A new, properly functioning 1999 Chevrolet 1500 PCM can resolve these issues if the module is the cause.
How long does the programming take?
Programming is completed after you provide us with your VIN. We typically program and ship the module within one business day to get you back on the road as quickly as possible.
What if my part number is slightly different?
This module is a direct replacement for several part numbers, including 16265035 and 8162634940. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.